Odd Nerdrum (born 8 April 1944) is a Norwegian figurative painter. A controversial figure in Norway, he is known for his anti-modernist stance while he is also admired internationally for his skill and technique, as well as his extraordinary subject matter. Themes and style in Nerdrum's work reference anecdote and narrative. Primary influences by the painters Rembrandt and Caravaggio help place his work in direct conflict with abstraction and conceptual art. Works include still life paintings of small, everyday objects, portraits and self-portraits, and large paintings allegorical and apocalyptic in nature. The figures in Nerdrum's paintings are often dressed as if from another time and place.

Nerdrum was educated at Oslo Waldorf School and later at the Art Academy of Oslo. Disillusioned with the art form taught at the academy and with modern art in general Nerdrum began to teach himself to paint in a post-modern style with Rembrandt and Caravaggio as influences. In 1965, he began a several-months study with the German artist Joseph Beuys. In Fenomenet Nerdrum [The Nerdrum Phenomenon], Jan-Erik Ebbestad Hansen traces Nerdrum's sense of belonging in older cultural traditions, his skepticism toward a rationality that rejects the spiritual in nature and humanity, and his aversion to modern technology and ways of life, back to the influence of anthroposophy.

Nerdrum says that his art should be understood as kitsch rather than art as such. On Kitsch, a manifesto composed by Nerdrum, describes the distinction he makes between kitsch and art. Nerdrum's philosophy spawned the Kitsch movement among his students and followers, who call themselves kitsch painters rather than artists.

Nerdrum was born in Sweden. His Norwegian parents were resistance fighters who had fled German-occupied Norway to Helsingborg, Sweden during World War II where Nerdrum, subsequently, was born. At the end of the war Nerdrum returned to Norway with his parents. By 1950 Nerdrum's parents had divorced leaving the mother to raise Odd and his younger brother. In 1993, Nerdrum discovered that his father was not his biological father; his mother had had a relationship with the architect David Sandved. Nerdrum was born from this liaison.

Odd Nerdrum grew up as the son of lawyer and airline director Johan Nerdrum and shipowner's daughter Edith Marie (Lillemor) Nerdrum. He was born in Helsingborg, Sweden in 1944. His parents, then Resistance fighters, had been sent to Sweden from German-occupied Norway to direct guerrilla activities from outside the country. A year later, at the end of the war, Odd and his parents moved back to Norway. Lillemor, his mother, soon after, went to New York to study at the Fashion Institute of Technology. Nerdrum felt unwanted and abandoned; this feeling would stay with him until he was in his late forties. In 1950, Nerdrum's parents divorced, leaving Nerdrum's mother, Lillemor, to raise two small children, Odd, and his younger brother.

Nerdrum's father, Johan Nerdrum, later remarried. Although he was supportive of Odd, he kept an emotional distance between himself and his son. At his death, Odd was asked not to attend the funeral. He found out three years later that Johan was not his biological father. Odd, was in fact, the result of a liaison between David Sandved and Lillemor. Lillemor and Sandved had had a relationship prior to Lillemor's marriage, and this was resumed during the war in a period when Johan was absent. Richard Vine, art critic, describes this episode in Nerdrum's life as one which created "a conflicted preoccupation with origins and personal identity", that "came natural to Nerdrum" and was represented in his pictures. He would go on to make paintings about these experiences.

Nerdrum began his formal education in 1951 in Oslo, in the private Oslo Waldorf School (Rudolf Steinerskolen i Oslo). In Norway, anthroposophy in general and the Waldorf schools in particular have been strongly associated with the cultural and intellectual elite of the country since the early 20th century, and the school attracted a combination of children of artists, academics and financial elites. This education would set Odd apart from his contemporaries. The system was based on anthroposophy that saw mankind as once living in harmony with the universe but now existing in a lesser state of rationality. Through spiritual or esoteric practice, Steiner believed mankind could find its way back to a connection with higher realities and to renewed harmony with the universe. Learning for students was often kinesthetic, for example, through dramatic enactments of history and fantasy, and through musical exercises that were reminiscent of the patterns found on ancient Greek vases, depicting figures moving in parallel patterns. These parallel patterns could be found in later Nerdrum work, as can a sensibility for iconographic images and costume.

Jens Bjørneboe, Norwegian author and mentor, said Nerdrum even at a young age exhibited tendencies of innate talent and industry, but also impatience with those with less ability than himself.